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Analog Devices Inc./Maxim Integrated MAX6418UK46
- Part No.:
- MAX6418UK46
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK46.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,112
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Product details
Overview
MAX6418UK46 from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (4.625V, ±2.5%) and one adjustable RESET IN input (1.26V reference) for monitoring secondary supply rails. It features an active-low push-pull RESET output, capacitor-adjustable reset timeout (275µs to 5.75ms), manual reset capability via MR pin, and operates across -40°C to +125°C. It is used in automotive ECUs to independently monitor main 5V and auxiliary 3.3V supplies during cold-crank and load-dump events.
For engineers reviewing the MAX6418UK46 datasheet, MAX6418UK46 pinout, MAX6418UK46 application, or MAX6418UK46 equivalent, this page delivers verified electrical parameters, dual-threshold supervision logic, SOT23-5 package layout guidance, AEC-Q100 qualification status, and real-world timing behavior under voltage transients - all critical for brownout-resilient embedded controller design.
Technical Context
The MAX6418UK46 implements dual independent reset comparators: one laser-trimmed bandgap reference for VCC (4.625V nominal) and one precision 1.26V internal reference for the external resistor-divider–based RESET IN input. Its reset assertion logic triggers when either voltage falls below its respective threshold or MR is pulled low.
Reset deassertion is governed by a 240nA current source charging an external capacitor on SRT; the timeout period (tRP = 2.71×10⁶ × CSRT + 275µs) is guaranteed over temperature (-40°C to +125°C) with ±15% variation. The push-pull RESET output drives valid logic down to VCC = 1V, with VOL ≤ 0.4V at 3.2mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 4.625V ±2.5% - factory-laser-trimmed for stable 5V rail monitoring without external components |
| Adjustable Input Reference | 1.26V ±33mV hysteresis - enables precise monitoring of secondary rails (e.g., 3.3V, 2.5V) using high-impedance resistor dividers |
| Quiescent Current | 1.7µA typical at VCC = 1.8V - ensures minimal battery drain in always-on automotive modules |
| Reset Timeout Range | 275µs to 5.75ms - set externally via 0–1500pF capacitor on SRT pin; supports µP reset hold times from fast-boot to safety-critical sequences |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments and industrial control cabinets |
| Output Type | Active-low push-pull - eliminates need for external pull-up; drives RESET directly into µP reset pin with 3.2mA sink capability at 4.5V |
| MR Input Logic | CMOS-compatible with internal 20kΩ pullup - allows momentary switch-to-ground implementation without debounce circuitry |
Pinout & Package
SOT23-5 package (5-pin, 1.6mm × 2.9mm, 0.95mm height), RoHS-compliant, rated for 150°C junction temperature and 300°C soldering peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; sinks up to 3.2mA at VCC ≥ 4.5V; valid down to VCC = 1V |
| 2 - GND | Ground reference | Common return path for all internal comparators and current sources; must be low-impedance |
| 3 - RESET IN | Adjustable reset comparator input | High-impedance node (10nA leakage); connects to center tap of R1/R2 divider to set secondary rail threshold (VMON_TH = 1.26V × (R1+R2)/R2) |
| 4 - SRT | Set Reset Timeout input | 240nA precision current source node; connect external capacitor (0–1500pF) to GND to program tRP; sensitive to stray capacitance/leakage |
| 5 - VCC | Supply voltage and fixed-threshold monitor input | Powers device and feeds primary comparator; monitors own supply from 1.0V to 5.5V; reset asserted if VCC < 4.625V × (1 − 2.5%) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises main VCC (4.625V) and secondary rail (e.g., 3.3V via resistor divider) - eliminates need for two discrete supervisors in multi-rail systems |
| Capacitor-programmable reset timeout | External 0–1500pF capacitor sets tRP from 275µs to 5.75ms with ±15% tolerance over full temperature range - enables precise alignment with µP boot requirements |
| Guaranteed reset validity to VCC = 1V | RESET output remains functional (VOL ≤ 0.4V at 3.2mA) even as supply drops to 1V - ensures reliable reset assertion during deep brownout conditions |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs duration when overdrive is ≤100mV below threshold - prevents spurious resets during load-dump or cranking transients |
| AEC-Q100 qualified option | Available in /V automotive-grade variant (MAX6418UK46/V+T) - qualified per AEC-Q100 Rev H for Grade 0 (−40°C to +150°C ambient) applications |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors both 5V main supply and 3.3V MCU core rail during cold-crank (VCC dip to 6V) and load-dump (VCC surge to 40V). IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET until both rails stabilize above 4.625V and 3.3V × 0.95, with 5ms timeout ensuring safe µP initialization. Use Value: Prevents code execution errors during battery voltage instability; eliminates risk of partial register corruption in safety-critical firmware. |
Use Scenario: Ensures fail-safe restart of ARM-based pump controller after battery swap or power interruption in portable medical devices. IC Role / Device Role / Timing Role: Supervises 3.7V Li-ion battery rail (via resistor divider) and 3.3V LDO output; asserts RESET on undervoltage or manual button press. Use Value: Guarantees deterministic state recovery before motor activation; meets IEC 62304 Class C software safety requirements. |
| Industrial PLC I/O Module | Smart Energy Meter MCU |
Use Scenario: Detects failure of isolated 24V field power and 5V logic supply in DIN-rail mounted controllers exposed to EMI-rich factory floors. IC Role / Device Role / Timing Role: Uses RESET IN to monitor 24V via 10:1 divider (threshold = 2.4V) and VCC to monitor 5V rail; provides 2ms reset hold time. Use Value: Enables rapid fault isolation without system-level watchdog intervention; reduces MTTR through deterministic hardware reset. |
Use Scenario: Supervises 3.3V MCU supply and 1.8V RTC backup rail in utility meters operating 15+ years in outdoor enclosures. IC Role / Device Role / Timing Role: Fixed threshold monitors main 3.3V rail; adjustable input watches 1.8V RTC rail via 1.4MΩ/1MΩ divider (threshold = 1.8V). Use Value: Preserves meter calibration data during brownouts; maintains accurate timekeeping through power loss with zero firmware overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6420UK46 | Active-low open-drain RESET output instead of push-pull; requires external pull-up resistor | Better suited for level-shifting or wired-OR reset bus configurations where multiple supervisors share one reset line | Select MAX6420UK46 only when open-drain topology is required for bus arbitration or mixed-voltage logic interfacing |
| TPS3808G33 | Fixed 3.3V VCC threshold only; no adjustable input; 200ms min timeout (non-adjustable); higher ICC (8µA) | Limited to single-rail monitoring; lacks dual-threshold flexibility and ultra-low quiescent current for battery operation | Choose TPS3808G33 only for cost-sensitive, single-supply designs where adjustable timeout and secondary rail monitoring are unnecessary |
Compared with MAX6418UK46, MAX6420UK46 trades push-pull drive strength for bus-sharing capability, while TPS3808G33 sacrifices dual-rail supervision and micropower operation for simplified BOM and TI ecosystem integration - making MAX6418UK46 the optimal choice for AEC-Q100-compliant dual-rail automotive and industrial systems requiring sub-2µA quiescent current.
Availability
MAX6418UK46 is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, industrial PLC I/O modules, smart energy meter MCUs, and battery-powered embedded controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6418UK46 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and medical applications, with emphasis on reliability, low power, and high integration.
The MAX6412–MAX6420 family was engineered specifically for robust microprocessor supervision in harsh environments, delivering dual-voltage monitoring, capacitor-adjustable timing, and AEC-Q100 qualification in miniature SOT23-5 packages.
FAQ
What is the exact fixed reset threshold voltage for MAX6418UK46?
The MAX6418UK46 has a factory-laser-trimmed VCC reset threshold of 4.625V, with ±2.5% accuracy over the full operating temperature range (-40°C to +125°C). This value is confirmed in Table 1 of the datasheet (suffix "46" corresponds to 4.509V min / 4.625V typ / 4.741V max), and applies exclusively to the VCC input - not the adjustable RESET IN pin.
Does MAX6418UK46 support manual reset functionality?
Yes, MAX6418UK46 includes a manual reset (MR) input on Pin 3. Pulling MR low asserts RESET for the full timeout period, then holds it asserted for the programmed delay after release. An internal 20kΩ pullup resistor allows MR to be left unconnected when unused, and a momentary switch to ground provides simple field-service reset capability without external components.
How do I calculate the resistor values for monitoring a 3.3V rail using the RESET IN pin on MAX6418UK46?
To monitor 3.3V with MAX6418UK46's RESET IN pin, use VMON_TH = 3.3V and VRST = 1.26V in the formula R1 = R2 × (VMON_TH/VRST − 1). Select R2 = 1MΩ (standard high-impedance value), yielding R1 = 1MΩ × (3.3/1.26 − 1) ≈ 1.62MΩ. Use 1% metal-film resistors; total divider current is ~2.1µA at 3.3V, preserving ultra-low system power consumption.
Is MAX6418UK46 qualified for automotive applications?
The base MAX6418UK46 is rated for -40°C to +125°C operation but is not AEC-Q100 qualified. However, the automotive-grade variant MAX6418UK46/V+T is explicitly qualified per AEC-Q100 Rev H Grade 0 (−40°C to +150°C ambient) and is available through authorized distributors. Always specify the /V suffix for automotive production use.
What is the minimum capacitor value needed to achieve a 1ms reset timeout with MAX6418UK46?
Using the formula CSRT = (tRP − 275µs) / 2.71×10⁶, a 1ms (0.001s) timeout requires CSRT = (0.001 − 0.000275) / 2.71×10⁶ ≈ 268pF. A standard 270pF ceramic capacitor (X7R, <10nA leakage) meets this requirement and yields tRP ≈ 1.01ms at +25°C, within datasheet tolerance. Larger capacitors increase timeout linearly.
MAX6418UK46 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.625V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6418UK46 FAQ
1.How can I place an order for MAX6418UK46 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK46 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6418UK46 reliable?
The price and inventory of MAX6418UK46 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK46 is usually 5 days.
3.What payment methods are accepted for MAX6418UK46?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK46 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK46?
MAX6418UK46 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK46 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6418UK46?
For technical support, including MAX6418UK46 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK46 requirements.
6.How does Aetrix verify that MAX6418UK46 is sourced from the original manufacturer or authorized distributors?
All MAX6418UK46 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6418UK46 meets industry standards.
7.What is the process for return or replacement of MAX6418UK46?
All MAX6418UK46 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK46, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6418UK46 part is unused and in its original packaging.
Return procedure for MAX6418UK46:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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